Question

我有课甲板

import java.util.Random;
public class Deck implements DeckActions{
    private static Card[] cards=new Card[52];
    public Deck () {
        int i=0;                                    
        for (Suit suit : Suit.values()){
            for (Rank rank : Rank.values()){
                cards[i++]=new Card(rank,suit); 
            }
        }
    }

    public Card draw() {                                 
        return cards[0];
    }

    public void shift(int times) {                          
        Random randomGenerator=new Random();
        int card1=randomGenerator.nextInt(52);
        int card2=randomGenerator.nextInt(52);

        for (int counter=0;counter < times; counter++){

        Card temp=new Card(null,null);
        temp=cards[card1];
        cards[card1]=cards[card2];
        cards[card2]=temp;
        }
    }
    public void show() {                            
        for (int i=0;i<cards.length;i++){
            System.out.println(cards[i].toString());    
        }   
    }
}

实现接口

public interface DeckActions {

    public Card draw();                 
    public void shift(int times);       
    public void show();                 

}

我遇到的问题是Shift方法实际上并没有改变甲板阵列。我错过了什么？我真的无法弄清楚。

这是我的主类，我试图用类似100或52的int调用该方法，但show总是显示相同的数组

public class TestCard {

    public static void main (String [] args) {
        Deck deck=new Deck();
            deck.show();
        deck.shift(52);
        System.out.println("Shifted");
        deck.show();

    }
}

Answer 1

问题是生成随机卡片交换的线路是外部循环，所以你总是交换相同的2张卡片。尝试：

 public void shift(int times) {                          
    Random randomGenerator=new Random();

    for (int counter=0;counter < times; counter++){

       int card1=randomGenerator.nextInt(52);
       int card2=randomGenerator.nextInt(52);

       Card temp=new Card(null,null);
       temp=cards[card1];
       cards[card1]=cards[card2];
       cards[card2]=temp;
    }
}

P.S：现场卡是静止的任何理由？

使用相同类的方法修改数组

1 个答案: